RIVER GAUGE · BIG SIOUX RIVER
Big Sioux River at Watertown Sioux Conifer Road
Codington County, South Dakota
Water level3.18 ft
Flow—
Last readingSep 16, 2026, 4:15 PM UTC (last recorded)
Action8 ft
Minor flood9 ft
Moderate flood10 ft
Major flood12 ft
The past week
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What floods at each level
- 15.5 ft
The bridge on 14th Ave NW is overtopped.
- 14 ft
The bridge on Sioux Conifer Road is overtopped.
- 12 ft
Sioux Conifer Road floods south of the gauge, and water reaches the bottom of the bridge at the gauge.
- 10 ft
Significant amounts of pasture land are flooded.
- 8 ft
Minor lowland flooding begins, mainly upstream of the gauge.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Apr 5, 1997 | 12.49 ft | 5,800 cfs |
| Apr 6, 2001 | 11.58 ft | 3,730 cfs |
| Apr 7, 1969 | 11.4 ft | 1,750 cfs |
More on Big Sioux River
UpstreamBig Sioux River at Lake Kampeska
Big Sioux River near Brandon
Big Sioux River near Bruce
Big Sioux River near Brookings
Big Sioux River near Estelline
Big Sioux River above Flandreau
Big Sioux River near Jefferson
Big Sioux River near Richland
Big Sioux River below Watertown
Big Sioux River above Canton
Big Sioux River near Castlewood
Get an alert when Big Sioux River rises
Save this gauge in the free StormCast app and pick the level that matters to you. Your phone goes off when the water gets there.
